Miticidal method containing active fluoro phthalimide derivatives

ABSTRACT

A METHOD OF CONTROLLING MITES WITH COMPOUNDS OF THE FORMULAS: 2-(F-CCL2-CCL2-S-),1,3-DI(O=)ISOINDOLINE   ISOINDOLINE   2-(F-CCL2-CCL2-S-),1,3-DI(O=)-3A,4,7,7A-TETRAHYDRO

'United States Patent Oflice 3,796,802 Patented Mar. 12, 1974 US. Cl. 424-274 2 Claims ABSTRACT OF THE DISCLOSURE A method of controlling mites with compounds of the formulas:

E C1 C1 N s t .s a. a. A

i and C1 Cl DESCRIPTION OF THE INVENTION This is a division of application Ser. No. 122,987, filed Mar. 10, 1971.

This invention is directed to novel compounds which may be generally described as fiuoro phthalimide derivatives which are active miticides. The compounds of the present invention are as follows:

E Ugasn t n and In general, the above two compounds can be prepared by reacting an appropriate phthalimide compound with an appropriate fluoro sulfenyl chloride to produce the end product.

In order to illustrate the merits of the present invention the following examples are provided:

EXAMPLE 1 N- Z-fluoro-l, 1,2,2-tetrachlor0ethylthi0) -tetrahydro phthalimide A first material was prepared by mixing together 100 ml. water and 12.6 g. (0.05 mole) of 1,1,2,2-tetrachloro- 2-fluoroethylsulfenyl chloride. Then, a second solution containing 7.5 g. (0.05 mole) of tetrahydro phthalimide and 2.0 g. (0.05 mole) sodium hydroxide and ml. of water were mixed together. The second solution was then added to the first over a period of five minutes at '10- 15 C. with stirring and cooling. A solid formed and the mixture was stirred for 30 minutes, when 100 ml. of chloroform was added. The chloroform solution was dried over magnesium sulfate and evaporated in vacuum to yield 9 g. of a yellow oil. On standing, crystals formed. Then, 10 ml. of n-pentane was added and the crystals filtered off and washed with additional n-pentane to yield 3.0 g. of crystals having a M.P. of -1l5 C.

EXAMPLE 2 N-(2-fluoro-1,1,2,Z-tetrachloroethylthio)- phthalimide duced pressure and the residue dissolved in mixed chloroform andjwater. The chloroform layer was evaporated, washed twice with a cold sodium hydroxide solution and twice with water, dried over sodium sulfate, filtered and stripped. A white solid was formed, having a M.P. of 147-149" C. The yield was 26.9 g.

Entomological testing methods The compounds of the present invention were tested to show activity against two-spotted mites as follows: Pinto beans Phaseolus sp.) plants, approximately 2-3 inches tall, were transplanted into sandy loam soil in 3" clay potsand infested with 50-75 aphids of mixed ages. Twenty-four hours later they were sprayed, to the point of run-01f, with aqueous suspension of the toxicant. Aliquotsof the toxicant, dissolved in appropriate solvent, are diluted in water to which has been added 0.0002% of a conventional wetting agent such as a polyoxy-ethylene sorbitan monolaurate ether of alkylated phenolic phenols blended with organic sulfonates. Test concentrations ranged from 0.05% to that at which 50% mortality is obtained. Mortality is recorded after fortyeight hours and the LD values are expressed as percent active ingredients in the aqueous suspensions. The

TABLE IContlnued v Percent 4% Compound C1 C1 number Structure P.E. Egg S 5 H 01 -s-( 3oH 2. The method of controlling mites comprising applying to a mite infested habitat a miticidally effective amount of the compound of the structure 0 II t 4- 0 0.005 0.05

NS--( (}-F (J1 (J1 l I g 01 Cl 0 References Cited (Examp1e2, UNITED STATES PATENTS 3,036,088 5/1962 Harris, Ir. 424-274X As can be seen from the above comparative data, 3,178,447 4/1965 Kohn 424-267X Compounds No. 2 and 4 exhibit substantially higher activity than those obtained in the prior art Compounds FOREIGN PATENTS ag??? f a is: 967,232 3/1950 France 424-274 1. The method of controlling mites comprising applyv ing to a mite infested habitat a miticidally elfective ALBERT Y Pnmflry Exammer amount of the compound of the structure R. Asslstam Exa'mlflef 

